Gentry Coal Bed
Lithostratigraphy: McCormick Group >>Caseyville Formation >>Gentry Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Morrowan Series
Allostratigraphy: Absaroka Sequence
Primary source
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
Contributing author(s)
M. E. Hopkins and J. A. Simon
Name
Original description
The Gentry Coal Member of the Caseyville Formation (Kosanke et al., 1960, p. 29).
Derivation
Named for Gentry Landing, Hardin County.
Other names
It previously was called the Battery Rock Coal (Owen, 1856, No. 1 vertical section).
History/background
Type section
Type location
The type locality consists of exposures near Gentry Landing (SW 26, 11S-10E).
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
Its exact relation to the Sellers Limestone has not been established, although field relations suggest that the Gentry is slightly above the Sellers.
Extent and thickness
Lithology
The Gentry Coal has been identified as a thin coal in several scattered localities in southeastern Illinois but is apparently not persistent. It was mined more than 100 years ago in small mines near the settlement of Lamb in Hardin County. It is underlain by a thin underclay, which overlies a thick, gray, silty shale that is equivalent to part of the Drury Shale. It is overlain by a shale that also is equivalent to part of the Drury Shale.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.
OWEN, D. D., 1856, Report of the geological survey in Kentucky made during the years 1854 and 1855: Kentucky Geological Survey Bulletin, v. I, Series 1, 416 p.
ISGS Codes
Stratigraphic Code | Geo Unit Designation |
---|---|